Taishan. 7 foot tall, 280 pound Chinese boxer. He started as a kickboxer but switched over to traditional boxing.
He's about as raw as they get and has only fought two fights against complete tomato cans. Here's what he looks like:
He's 26 and has no amateur boxing experience. Obviously the ceiling is a bit limited but if he's at his peak he could have a shot post-Klitschko.